Cat bed



FIG. 1 is a rear and right side perspective view of a cat bed, showing my new design;

FIG. 2 is a left side perspective view thereof, seen slightly from above;

FIG. 3 is a front perspective view thereof, seen slightly from above; and,

FIG. 4 is a right side elevational view thereof. 

The ornamental design for a cat bed, as shown. 